air filter identification

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tom collingwood
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air filter identification

#1 Post by tom collingwood » Mon Feb 03, 2020 11:23 pm

I have these air fliters in my parts stash. Two are taller then the rest. Some have smaller diameter. I also have two large cans.
Anybody know what they are correct for?
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Mike Wilson
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Re: air filter identification

#2 Post by Mike Wilson » Tue Feb 04, 2020 12:03 am

All for Zenith carbs. Black canister types I think were for very late A's or T-5's to the C's. Exceptions would be Super 90's and SC's.
Round mesh type early to A's. The double dome top I think is for an industrial engine.

Guys: please correct me if I'm wrong!

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Ed Pimm
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Re: air filter identification

#3 Post by Ed Pimm » Tue Feb 04, 2020 12:38 am

Black are Zenith, Large diameter mesh Zenith, Smaller diameter mesh are Solex 32 or 40 depending on height.
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Mike Wilson
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Re: air filter identification

#4 Post by Mike Wilson » Tue Feb 04, 2020 12:41 am

Thanks for that clarification, Ed. I forgot about the 32's and 40's.

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Vic Skirmants
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Re: air filter identification

#5 Post by Vic Skirmants » Tue Feb 04, 2020 9:10 am

Large diameter mesh; Zenith or Solex 40. Small diameter mesh; Solex 32; unless the mounting hole is larger; then Solex 40. But I don't think I've ever seen one of those.

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tom collingwood
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Re: air filter identification

#6 Post by tom collingwood » Fri Feb 07, 2020 11:24 pm

i have these two sets of air filters that both fit on my Solex 32. (the other sets are larger for a different carb)

one set is taller then the other and they both fit th solex.
What is the reason for the different height?
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James Davies
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Re: air filter identification

#7 Post by James Davies » Sat Feb 08, 2020 1:21 am

For your Solex 32 Knechts, the taller ones are for pre-A cars, the shorter ones for 356A. The intake manifolds were taller on the 356A for the Solex 32 carbs, so therefore they shortened the filter to make the overall height roughly the same. Some short ones were used in 1952 as well, but yours are 356A for 616/1 motor given the logo and writing on top. The other two sets you have that fit Solex 32 and are tall are for bent-window pre-As.

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Vic Skirmants
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Re: air filter identification

#8 Post by Vic Skirmants » Sat Feb 08, 2020 8:48 am

James; would the short 1952 32mm filters be for those early 1500 engines that used an extension on top of the short manifold?

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C J Murray
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Re: air filter identification

#9 Post by C J Murray » Sat Feb 08, 2020 9:02 am

The Solex single barrel 40mm air filter fits the 1958(and later) Zenith carbs. !959 started the black can with a real filter inside but 1959 had 3 top clamps whereas 1960 and later cans had 2 clamps.
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Spencer Harris
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Re: air filter identification

#10 Post by Spencer Harris » Sun Feb 09, 2020 1:30 pm

I put this spreadsheet together a few months ago as I was going through my collection of early Knecht mesh filters and trying to figure out what was what. The information comes mostly from old posts on the forum. Tall, short, large text, small text, no text, two lines, four lines - probably not 100% accurate, but a reasonable start. If someone spots an error or two please PM and I'll correct and re-post.
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Jules Dielen
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Re: air filter identification

#11 Post by Jules Dielen » Mon Feb 10, 2020 11:42 pm

I have a pair of tall skinny silver mesh for the wide solex 40 opening. Also fits on top of a zenith but it looks a little wonky. Same height as the later A filters, just a lot skinnier.
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James Davies
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Re: air filter identification

#12 Post by James Davies » Thu Feb 13, 2020 10:28 pm

Would love to see photos of those Jules.

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